Idle Air Control Valve, Air Injection Solenoid Valve, Purge Control Valve Solenoid - Page 2 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #11 of 16 Old 09-15-2015, 03:27 PM Thread Starter
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Originally Posted by gyrotumbler View Post
Mine started at 1500 rpm yesterday it didn't stall, but engine doesn't sound good at first.
Yes...the engine "hammers" at 1500 RPM cold, as if the ignition timing is advanced too far for the 1500 RPM speed, causing the engine to almost try to run backward. It's like the flame propagation starts and then the too-slowly-rising piston slams into it. When my bike stalls, it almost sounds like the piston hits up against a hard stop inside the cylinder.

This is an interesting explanation of Honda's "PGM-FI".

I'm intrigued about the IAT (Intake Air Temperature) sensor...

Last edited by Stichill; 09-15-2015 at 03:57 PM. Reason: Add link
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post #12 of 16 Old 09-22-2015, 10:05 AM
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About the time my bike started acting up I had switched from regular gas to ethanol free gas which is 90 octane in Florida.

Sunday I filled up with 3 gallons of regular and Monday the bike started ok. Around 1400 or 1500 rpms, seemed kind of low but no stumbling or hammering.

Today bike started normal again no problems at all.

The grass is always greener . . .

Last edited by gyrotumbler; 09-22-2015 at 10:45 AM.
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post #13 of 16 Old 08-17-2016, 12:56 AM
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Originally Posted by Stichill View Post
Yes...the engine "hammers" at 1500 RPM cold, as if the ignition timing is advanced too far for the 1500 RPM speed, causing the engine to almost try to run backward. It's like the flame propagation starts and then the too-slowly-rising piston slams into it. When my bike stalls, it almost sounds like the piston hits up against a hard stop inside the cylinder.

This is an interesting explanation of Honda's "PGM-FI".

I'm intrigued about the IAT (Intake Air Temperature) sensor...
Did you ever solve this problem my bike 2012 abs has the exact same issues,put factory exhaust back on and reset ecu,but still the same
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post #14 of 16 Old 08-17-2016, 05:10 AM
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meant to say ,ECM,seems to start a bit easier with factory exhaust and reset,but still struggle to idle and as soon as you touch the throttle it dies
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post #15 of 16 Old 08-17-2016, 10:01 PM Thread Starter
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It seems to have mostly sorted itself out over time. I am not really having issues any more.
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post #16 of 16 Old 08-24-2016, 03:55 AM
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It seems to have mostly sorted itself out over time. I am not really having issues any more.
Did you do anything different to the bike?,ive changed the fuel ,and since putting the original exhaust on seems alot better,still idles a bit slow but if i turn it off then on again it seems to adjust to proper,idle
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